696 



FACIAL NERVE. 



into direct relations with the auricular branch of the vagus (<5), which 

 crosses its path in the mastoid canal and from which it may receive sen- 

 sory fibers. 



6. After making its exit from the canal the facial nerve gives off only 

 motor branches to the stylohyoid muscle and the posterior belly of the 

 digastric, to the occipital muscle, as well as to all of the muscles of the 

 external ear and of the face, to the buccinator and to the platysma. It 

 contains also sweat -fibers for the face. 



Although the facial nerve, in most of its branches on the face, is under the 

 control of the will, most persons are unable to move voluntarily the muscles 

 of the nose and the auricle. Landois was able to contract the transverse and 

 oblique muscles of the auricle, a rumbling sound being at the same time audible in 



Frontal muscle. 



Corrugator supercilii. 

 Orbicularis palpebrarum. 



Uppermost facial branch, 

 Facial trunk, 



Mm . retrahens et attolens auriculae . 



Occipital muscle. 



Middle facial branch. 



Stylohyoid muscle. 



Digastric muscle. 



Lower facial branch 



Compressor nasi et pyramidalis. 

 Levator labii sup. alaeque nasi. 

 Levator labii superioris propriis. 

 Zygomaticus minor. 

 Dilatator narium. 

 Zygomaticus major. 



Orbicularis orus. 



Levator menti. 



Quadratus menti. 



Triangularis menti. 



FIG. 245. Motor Points of the Facial Nerve and of the Muscles Supplied by It (after Eichhorst). 



the corresponding ear from the flexion of the cartilage of the external ear. He was 

 able also to contract one-half of the Orbicularis oris of the lower lip. According 

 to Mendel the fibers of the facial for the orbicularis take their origin from the 

 posterior extremity of the oculomotor nucleus. 



On the face the facial branches unite regularly with those of the tri- 

 geminus. In this way the latter furnish also muscle-sense fibers to the 

 muscles. The peripheral anastomoses of the sensory branches of the 

 auricular nerve of the vagus and the great auricular nerve have the same 

 significance for the muscles of the ear, as well, finally, as the anastomoses 

 of the sensory filaments from the third cervical nerve for the facial 

 fibers of the platysma. Division of the facial at the stylomastoid 



